<template>
    <div class="app-container">
        <!--表单-->
        <el-form :inline="true" class="demo-form-inline">

            <el-form-item>
                <el-select v-model="searchObj.type" clearable placeholder="请选择">
                    <el-option label="学员登录数统计" value="login_num" />
                    <el-option label="学员注册数统计" value="register_num" />
                    <el-option label="课程播放数统计" value="video_view_num" />
                    <el-option label="每日课程数统计" value="course_num" />
                </el-select>
            </el-form-item>

            <el-form-item>
                <el-date-picker v-model="searchObj.begin" type="date" placeholder="选择开始日期" value-format="yyyy-MM-dd" />
            </el-form-item>
            <el-form-item>
                <el-date-picker v-model="searchObj.end" type="date" placeholder="选择截止日期" value-format="yyyy-MM-dd" />
            </el-form-item>
            <el-button :disabled="btnDisabled" type="primary" icon="el-icon-search" @click="showChart()">查询</el-button>
        </el-form>

        <div class="chart-container">
            <div id="chart" class="chart" style="height:500px;width:100%" />
        </div>
    </div>
</template>
<script>
import echarts from 'echarts'
import daily from '@/api/sta'

export default {
    data() {
        return {
            searchObj: {
                type: '',
                begin: '',
                end: ''
            },
            btnDisabled: false,
            chart: null,
            title: '',
            xData: [],
            yData: []
        }
    },
    methods: {
        showChart() {
            this.initChartData()
            // this.setChart()
        },

        // 准备图表数据
        initChartData() {
            daily.showChart(this.searchObj).then(response => {
                // 数据
                this.yData = response.data.dataList

                // 横轴时间
                this.xData = response.data.dateList

                // 当前统计类别
                switch (this.searchObj.type) {
                    case 'register_num':
                        this.title = '学员注册数统计'
                        break
                    case 'login_num':
                        this.title = '学员登录数统计'
                        break
                    case 'video_view_num':
                        this.title = '课程播放数统计'
                        break
                    case 'course_num':
                        this.title = '每日课程数统计'
                        break
                }

                this.setChart()
            })
        },

        // 设置图标参数
        setChart() {
            // 基于准备好的dom，初始化echarts实例
            this.chart = echarts.init(document.getElementById('chart'))
            // console.log(this.chart)

            // 指定图表的配置项和数据
            var option = {
                // x轴是类目轴（离散数据）,必须通过data设置类目数据
                xAxis: {
                    type: 'category',
                    // data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
                    data: this.xData//-------绑定数据
                },
                // y轴是数据轴（连续数据）
                yAxis: {
                    type: 'value'
                },
                // 系列列表。每个系列通过 type 决定自己的图表类型
                series: [{
                    // 系列中的数据内容数组
                    // data: [820, 932, 901, 934, 1290, 1330, 1320],
                    data: this.yData,//-------绑定数据
                    // 折线图
                    type: 'line'
                }],
                title: {
                    text: this.title
                },
                tooltip: {
                    trigger: 'axis'
                },
                dataZoom: [{
                    show: true,
                    height: 30,
                    xAxisIndex: [
                        0
                    ],
                    bottom: 30,
                    start: 10,
                    end: 80,
                    handleIcon: 'path://M306.1,413c0,2.2-1.8,4-4,4h-59.8c-2.2,0-4-1.8-4-4V200.8c0-2.2,1.8-4,4-4h59.8c2.2,0,4,1.8,4,4V413z',
                    handleSize: '110%',
                    handleStyle: {
                        color: '#d3dee5'

                    },
                    textStyle: {
                        color: '#fff'
                    },
                    borderColor: '#90979c'
                },
                {
                    type: 'inside',
                    show: true,
                    height: 15,
                    start: 1,
                    end: 35
                }]
            }

            this.chart.setOption(option)
        }
    }
}
</script>